Showing papers by "Stan Z. Li published in 1999"
TL;DR: A novel classification method, called the nearest feature line (NFL), for face recognition, based on the nearest distance from the query feature point to each FL, which achieves the lowest error rate reported for the ORL face database.
Abstract: We propose a classification method, called the nearest feature line (NFL), for face recognition. Any two feature points of the same class (person) are generalized by the feature line (FL) passing through the two points. The derived FL can capture more variations of face images than the original points and thus expands the capacity of the available database. The classification is based on the nearest distance from the query feature point to each FL. With a combined face database, the NFL error rate is about 43.7-65.4% of that of the standard eigenface method. Moreover, the NFL achieves the lowest error rate reported to date for the ORL face database.
555 citations
20 Sep 1999
TL;DR: A novel trainable snake model, called EigenSnake, is presented in the Bayesian framework, where prior knowledge of a specific object shape is derived from a training set of the shape and incorporated into a Bayesian snake model in the form of the prior distribution.
Abstract: A novel trainable snake model called EigenSnake, is presented in the Bayesian framework. In the EigenSnake, prior knowledge of a specific object shape, such as that of face outlines and facial features, is derived from a training set of the shape and incorporated into a Bayesian snake model in the form of the prior distribution. Further, a "shape space", which is constructed on the basis of a set of eigenvectors obtained from principle component analysis, is used to restrict and stabilize the search for the optimal solution. The effectiveness is demonstrated by experiments, which shows that the EigenSnake produces more reliable and accurate results than existing models.
20 citations
Journal Article•
TL;DR: The prophylactic effect of Zhuling and BCG on bladder cancer recurrence was better than MMC, and the vale of thiotepa was not significant.
Abstract: Objective To lower postoperative recurrence rate of bladder cancer, the prophylactic effects of five kinds of method on bladder cancer were evaluated. Methods Between 1982 and 1997, 313 patients after TURBT or partial cystectomy were followed up for 2 to 15 years (average 7.6 years). These patients were divided into six groups: BCG, mitomycin C (MMC), thiotepa, Chinese herb medicine Zhuling (Grifola umbellata pilat), afterloading brachytherapy and control group. The prophylactic effects of them on postoperative recurrence of bladder cancer was evaluated. Results During the follow-up, the recurrence rates were 35.1% in BCG group, 34.9% in Zhuling group, 41.7% in MMC group, 52.6% in thiotepa group, 64.7% in control group, respectively. 25 high-risk patients with invading or multiple bladder cancer were treated by afterloading brachytherapy. They were followed up from 12 to 42 months, with a recurrence rate being 24.0%. Conclusions The prophylactic effect of Zhuling and BCG on bladder cancer recurrence was better than MMC. The vale of thiotepa was not significant. The afterloading brachytherapy was of great vale to invading or recurrent, multiple bladder cancer.
7 citations
Journal Article•
TL;DR: In some patients with malignant pheochromocytoma, histological findings are not consistent with their biological behaviors and radiotherapy of tumor bed and systematic chemotherapy should be emphasized.
Abstract: OBJECTIVE To review the experience with the diagnosis and treatment of malignant pheochromocytoma. METHODS Between 1986 and 1996, 7 patients with malignant pheochromocytoma were analysed. RESULTS Compared with benign pheochromocytoma of adrenal gland, the malignant one usually exceeded 7.0 cm in diameter, irregular in shape, invading the surrounding tissue and the normal structure of the effected adrenal gland disappeared. Bleeding and necrotic area were seen in tumor mass, even seemed as a cystic lesion with thick wall. In some patients, blood catecholamine and urine VMA significantly elevated without hypertension. The separating phenomenon and progressive weight loss, accelerated ESR were characteristics of malignant pheochromocytoma. CONCLUSIONS In some patients with malignant pheochromocytoma, histological findings are not consistent with their biological behaviors. Follow-up studies is mandatory in malignant pheochromocytoma as well as in benign one. Recurrence and/or metastasis after operation often occur in patients with malignant pheochromocytoma. In addition to early diagnosis and surgery, radiotherapy of tumor bed and systematic chemotherapy should be emphasized.
2 citations